Muffle-furnace.



No. 739,174. Patented September 15, 1903.

' UNITED STATES PATENT OFFICE.

THOMAS HARDIE, OF PHILADELPHIA, PENNSYLVANIA, ASSIGNOR TO PHILA- DELPHIA STEEL & IRON COMPANY, OF PHILADELPHIA, PENNSYLVANIA, A CORPORATION OF NEW JERSEY.

MUFFLE-FURNACE.

SPECIFICATION forming part of Letters Patent N 0. 739,174, dated September 15, 1903.

Application filed January 10, 1903 Serial No. 138,487. (No model.)

To all whom it may concern; 4:,and of which others, 8, extendfrom'the other Be it known that I, THOMAS HARDIE, a citifireplace 2 across the top of the chamber and 5 zen of the United States, residing at the city to the left-hand side of the floor-flue 4; As of Philadelphia, in the county of Philadelshown, the fines 7 and 8 alternate with each 5 phia and State of' Pennsylvania, have inother.

vented certain new and useful Improvements In use the articles to be heated are placed in Muffle-Furnaces', of which the following is in the chamber 3 and proper fires are made aspecification. in the fireplaces 1 and 2. The hot products The principal object of the present invenfrom these fireplaces traverse the lines 7 and 10 tion is to provide for the production of a Sin opposite directions and crosswise of-the uniformly high heat in every portion of the furnace and then reach the floor-flue 4 and furnace. travel back and forth lengthwise of the fur- Another object of the invention is to pronace past the baffle-walls and reach the offvide a furnace well adapted for annealing take 5. In this way the chamber 3 is exter- 15 and for processes where conversions are nally heated and the heat is distributed brought about under an even heat. throughout it with marked uniformity.

To these and other ends hereinafter set It will be obvious to those skilled in the art forth the invention comprises the improve-. 'to which my invention appertains that modiments to be presently described and claimed. fications may be made in detail without de- 20 The nature, characteristic features, and parting from the spirit thereof. Hence I do scope of my invention will be more fully unnot limit myself to the precise construction derstoodfromthefollowingdescription,taken and arrangement of parts hereinabove set in connection with the accompanying drawforth, and illustrated in the accompanying ings, forming part hereof, and in whichdrawings; but,

2 5 Figure l is a top or plan View of a furnace Having thus described the nature and obembodying features of the invention. Fig. 2 jects of my invention, what I claim as new, is a vertical sectional view taken on the line and desire to secure by Letters Patent,-is-- 7o 2 2 of Fig. 1. Fig. 3 is a horizontal sectional A muffle-furnace comprising fireplaces arview taken on the line 3 3 of Fig. 2, and Fig. ranged at the sides of an externally-heated o 4 is a sectional view taken on the line 4 4 of chamber, a longitudinally-subdivided floor- Fig. 3. flue having a chimney-outlet, and crown-fines In the drawings the furnace is shown as of of which some extend from one fireplace generally rectangular form in plan and as across the top of the chamber and to one side constructed of suitable masonry, the top beof the floor-flue and of which others extend 3 5 ing arched. from the other fireplace across the top of the 1. and 2 are fireplaces arranged at the sides chamber to the other side of the floor-flue,

of the externally-heated chamber 3. substantially as described.

4 is asubdivided floor-flue, having a chim- In testimony whereofI have hereuntosigned ney-outlet 5. The subdivisions are produced my name. 40 by means of baffle-Walls 6, as shown. There I are crown-fines, of which some, 7, extend from In presence ofthe fireplace 1 across the top of the chamber ALLAN J. OAssIDY, 3 and to the right-hand side of the floor-flue FRED. W. OASSIDY.

THOS. HARDIE. 

